CN111019172A - 叠片状硅土在薄膜加工中的应用 - Google Patents
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Abstract
本发明针对现有技术中化学品包装用薄膜存在的技术问题做出改进,将片状硅土材料应用到薄膜的加工当中,在化学品包装用薄膜的成型加工过程中,将叠片状硅土作为助剂加入,且所述叠片状硅土加入的重量与薄膜原料的重量比为0.5%‑2.0%。本发明通过利用该硅土材料,可同时实现三个功能:阻隔、保温、漫散射,并可同时提升拉伸性能,由于简化了加工时添加的助剂种类,加工难度也有所下降。
Description
技术领域
本发明属于包装薄膜技术领域,具体涉及叠片状硅土在薄膜加工中的应用。
背景技术
塑料薄膜是最常用的包装材料,包括PP、PE、NY、PET、PVC、PVDC涂布膜等。为了改善以上包装材料的品质、特性或加工性能,便于后续操作,在材料的实际生产中往往会添加一些辅助性化学品,即塑料薄膜添加剂。塑料薄膜添加剂是保障生产顺利进行和软包装产品质量的关键因素之一。塑料添加剂是指为改善塑料某些性能或改善塑料某些成型加工性需要加入的一些助剂。常用塑料助剂有增塑剂、热稳定剂、光稳定剂、抗氧剂、润滑剂、偶联剂、填充剂、抗冲击剂、加工改性剂、相容剂、阻燃剂、交联剂、发泡剂等。例如:加入增塑剂可以把硬聚氯乙烯变成软聚氯乙烯;加入抗氧剂和光稳定剂可以提高塑料的耐老化性能;加入润滑剂可以提高塑料成型过程中的流动性;加入阻燃剂可以提高塑料的阻燃性能等等;保温需要添加很容易吸潮的水滑石,增强需要添加茂金属或其他高分子树脂,达到漫散射需要添加漫散射剂,比如一些散光的颜料等。
而对于化学品包装用薄膜,则还要求具备一定的阻隔性能,在塑料加工已经需要使用那么多助剂的情况下,倘若再加入阻隔助剂,则会造成加工成膜的内部组分过于复杂,对薄膜的稳定性造成不良影响。
发明内容
本发明针对现有技术中化学品包装用薄膜存在的技术问题做出改进,将片状硅土材料应用到薄膜的加工当中。
本发明采用如下技术方案:
叠片状硅土在薄膜加工中的应用,在化学品包装用薄膜的成型加工过程中,将叠片状硅土作为助剂加入,且所述叠片状硅土加入的重量与薄膜原料的重量比为0.5%-2.0%。
优选地,所述薄膜原料包括聚乙烯、聚丙烯或聚氯乙烯。
优选地,所述叠片状硅土由多层片状硅土片叠合而成。
优选地,所述叠片状硅土的径厚比为50:1-100:1。
本发明的有益效果如下:
本发明在普通聚乙烯、聚丙烯、聚氯乙烯等薄膜中(包括大棚膜、化学品包装用膜),添加叠片状硅土,然后按照原工艺进行加工,硅土的片状结构,具有对氧气和水汽的阻隔作用,防止化学品被氧化等,而且从力学性能上来说,叠片状结构可以增强薄膜的拉伸性能,且借助于片状结构对红外线的反射作用,保温作用效果增强,有利于大棚膜保温;此外叠片状硅土对光的漫散射作用,可以隐藏包装物内产品,从外包装看不出里面的物品。
本发明所述叠片状硅土选用福建长泰万泰矿物制品有限公司的X-8000硅酸铝盐钾矿物质粉末(以下简称硅土),化学形式为SiO2·Al2O3·K2O·H2O,其地质环境使得矿物质本身具有微小的结晶粒子厚度(约200nm直径),这种粒子再聚集、组合形成一种高长厚比的薄片状结构,再通过插层法的生产工艺,将其剥离成一种径厚比较大的层片,根据不同需要将矿物粉体化、细化、化学处理、表面处理等,硅土的层片之间互相叠加,形成了叠层状结构,经过表面处理过的分子再与高分子架接,形成了一种牢固网状结构,这种结构很好的改善了其物理性能及综合性能。
叠片状硅土具有高的径厚比(50:1-100:1),低比表面积(BET 10-20)并同时具有低吸油值(DOP≤50)等特点,使得粉体具有适当的分散性及助分散性,在加工过程之中不仅可以降低物料粘度,同时有助于物料流动和加工;高的径厚比也赋予硅土二维纳米结构,通过与树脂体系的超分散可以发挥其纳米效应;硅土的全片状结构使得其本身具有十分优秀的阻隔性能,化学插层工艺将粉体表面嫁接活性羟基,并与表面进行偶联剂包覆处理,同时与二维纳米片状结构和巨大的比表面积共同作用下,对于硅土的物理性能和动态弹性体现出良好的效果。本发明通过利用该硅土材料,可同时实现三个功能:阻隔、保温、漫散射,并可同时提升拉伸性能,由于简化了加工时添加的助剂种类,加工难度也有所下降。
具体实施方式
为了使本发明的技术目的、技术方案和有益效果更加清楚,下面结合具体实施例对本发明的技术方案作出进一步的说明。
实施例1
将叠片状硅土应用于聚0.08mm乙烯薄膜的加工过程中,具体加工过程如下:将常规助剂、叠片状硅土以及线性低密度聚乙烯用混合机按照比例混合,使用螺杆挤出机,螺杆筒温度200-210℃,从模口吹出,模口温度250-260℃,外风冷却至45℃后收卷;其中,所述叠片状硅土加入的重量与薄膜原料的重量比为0.5%-2.0%。
与不添加硅土的聚乙烯薄膜相比,氧气通过率由49.3704 cm3/m2·24h·0.1MPa降低到20.2541 cm3/m2·24h·0.1MPa;保温覆盖同样条件下,温差由12℃减少到8℃;具有漫散射效果;拉伸强度由原来的拉伸强度16MPa提高到22 MPa,断裂伸长率由320%提高到421%,直角撕裂强度由62kN/m提高到93kN/m。
最后所应说明的是:上述实施例仅用于说明而非限制本发明的技术方案,任何对本发明进行的等同替换及不脱离本发明精神和范围的修改或局部替换,其均应涵盖在本发明权利要求保护的范围之内。
Claims (4)
1.叠片状硅土在薄膜加工中的应用,其特征在于:在化学品包装用薄膜的成型加工过程中,将叠片状硅土作为助剂加入,且所述叠片状硅土加入的重量与薄膜原料的重量比为0.5%-2.0%。
2.根据权利要求1所述的叠片状硅土在薄膜加工中的应用,其特征在于:所述薄膜原料包括聚乙烯、聚丙烯或聚氯乙烯。
3.根据权利要求1所述的叠片状硅土在薄膜加工中的应用,其特征在于:所述叠片状硅土由多层片状硅土片叠合而成。
4.根据权利要求3所述的叠片状硅土在薄膜加工中的应用,其特征在于:所述叠片状硅土的径厚比为50:1-100:1。
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Citations (4)
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CN1082071A (zh) * | 1992-07-29 | 1994-02-16 | 住友化学工业株式会社 | 气障树脂组合物和其薄膜及其制备方法 |
CN1511871A (zh) * | 2002-12-27 | 2004-07-14 | 中国石化北京燕化石油化工股份有限公 | 聚乙烯/蒙脱土复合阻隔材料 |
CN103724957A (zh) * | 2013-12-17 | 2014-04-16 | 浙江普利特新材料有限公司 | 一种新型聚乳酸薄膜材料及其制备方法 |
CN109867851A (zh) * | 2019-03-28 | 2019-06-11 | 中国科学院长春应用化学研究所 | 一种耐压抗冲击pe管材及其制备方法 |
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Patent Citations (4)
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CN1082071A (zh) * | 1992-07-29 | 1994-02-16 | 住友化学工业株式会社 | 气障树脂组合物和其薄膜及其制备方法 |
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刘英俊,刘伯元: "《塑料填充改性》", 31 May 1998, 中国轻工业出版社 * |
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